EHP桩复合地基承载特性现场载荷试验研究  

Field Load Test on Axial Capacity of a New Composite Pile

作　　者：李兴兵 李辉[2] 吉锋 强成仓 邱成春[4] LI Xingbing;LI Hui;JI Feng;QIANG Chengcang;QIU Chengchun(Jiangsu Hongji Water Resource Technology Co.,Ltd.,Yangzhou 225002;Jiangsu Province Engineering Investigation and Research Institute Co.,Ltd,Yangzhou 225000;The Eastern Route of South-to-North Water Diversion Project Jiangsu Water Source Co,Ltd,Nanjing 210000;School of Civil Engineering,Yancheng Institute of Technology,Yancheng 224051)

机构地区：[1]江苏鸿基水源科技股份有限公司,江苏扬州225002 [2]江苏省工程勘测研究院有限责任公司,江苏扬州200120 [3]南水北调东线江苏水源有限责任公司,南京210000 [4]盐城工学院土木工程学院,江苏盐城224051

出　　处：《土工基础》2020年第6期721-724,共4页Soil Engineering and Foundation

基　　金：淮河水利委员会治淮工程项目(HGBF-QT-41);江苏省水利科技项目(2015068);江苏省自然科学基金项目(BK20170477);国家自然科学基金项目(51808481、51978597)。

摘　　要：EHP桩(Environmental Homogeneous Plastic Pile)是一边成孔一边全置换浇筑充填形成物理力学性质可控可调的新型环保均质塑性桩体,以解决传统水泥土搅拌桩存在的桩体不均匀、桩身不连续和桩体强度偏低等问题。为探究EHP单桩及复合地基的承载性能,对水泥掺量为8%、10%、13%的EHP桩及复合地基进行了现场静载荷试验,并与传统水泥土搅拌桩承载性能进行对比。结果表明:单桩及复合地基均未加载到破坏,荷载-沉降曲线均为缓变形,最大荷载下累计沉降量随水泥掺量的增加而呈幂函数关系下降;相同水泥掺量时,EHP桩及复合地基的抵抗变形能力均优于传统水泥土搅拌桩,在保证加固效果时,可减少水泥用量;EHP单桩和复合地基承载力能够满足设计要求,具有良好的经济性和应用前景。The Environmental Homogeneous Plastic(EHP)pile is a new cement-soil mixing pile type with the controlled physical and mechanical properties.The pile is installed by injecting the environmentally friendly homogeneous plastic materials into the borehole.The new material for the pile has the advantages over the soil-cement mixed columns that usually have the issues of non-uniform,discontinued column shafts and low shaft strength.The field static plate loading tests were performed on composite soil and piles mixed with three different cement contents:8%,10%and 13%and the test results were compared with the conventional composite ground formed by the conventional soil-cement mixing columns.The results show that neither the single pile nor the composite foundation is loaded to failure,and the load settlement curveshave gradual deformation pattern.The cumulative settlement under the maximum load decreases with the increase of the cement content as a power function.At the same cement content,the deformation resistance of the EHP pile and composite foundation is better than that of the conventional soil-cement mixing columns,and the cement ratio can be reduced when the improvement effect is evident.The axial bearing capacity of EHP single piles and the composite foundations can meet the design requirements as well as cost effective for the project.

关 键 词：EHP桩 复合地基 承载力 静载荷试验 

分 类 号：TU413[建筑科学—岩土工程]